Electric motor



A. E. OSWALD ELECTRIC MOTOR Jan. 29, 1929.

Original Filed Dec. '7. 1 3 Sheets-Sheet 1 ATT H Jan. 29, 1929.. 1,700,329

A. E. OSWALD ELECTRIC MOTOR original Filed Dec. '2. 1921 3 Sheets-Sheet 2 //0 w m w W I g 1 INVEPU'ED //0 w w w 5 E] S L 3 @3 INVENTOR= BY 34% ATTO EY.

Patented Jan. 29, 1929.

tlhllTED STATES PATENT OFFICE.

ALFRED E. OSWALD, OF HACKENSACK, NEW JERSEY, ASSIGNOR TO U'NDERWOOD ELLIOTT FISHER COMPANY, OF NEW YORK, N. Y., A CGRPGRATION OF DELAWARE.

ELECTRIC MOTOR.

Original application filed December 7, 1921, Serial No. 520,488. Divided and this application filed November 20, 1926.

vention relates mainly to a novel ion a? d control block which may be ably att c ied to an electric motor so a to be placeable by any one of similar (lCflCl-S t'or flapting the motor to different con lit an object of the present invention to tor megulating the speed oft an alternz curri-uit motor at. will, and to maintain the speed substantially constant for the rate at which it is whether with or without load, or for various loads.

" invention is illustrated in connection 'tible motor disvith the unirel-sally-conve' 30, 1920). In said motor Elm ember A may be cite-cred by cutting sp ed r in or oiu cu auxiliary field coils, which, by reason of the characteristic magnetic cucnit oi the motor, also co-oporate with the main tiel coils to keep the speed of the mont. llv variously connecting the auxiliary lield coils, main field coils mature coils the motor may be adapted to oi c. it conditions, and to this end is per- Lilliitfitl) provided with a terminal board or plate on which is arranged a set of terminals tor the di t coils.

For cutti in and out the auxiliary coils, and thereby changing the speed ot' the motor e is pretirably employed a multi- -board, having a contact-lever it the auxiliary coils may be conwve a marimum opposition to the whencre ired, two, tour or six of the auxil'ary coils may be cut out, increasing the 40 speed accordingly. hen only two coils are it in the series, maximum speed is secured. The speed will winain substantially constant as established by the regulating switch.

In the preferred form of practicing th invent-ion, th s switch, together with the terminals oi? e auxiliary coils, is placed upon a board, which fastened upon the motor and carries a toll set 0t contacts tor the ditcoils. the armature, etc. This boart 21;: be double, or comprise two members or 9s. one of which forms the atoresaid periinal board and upon which are Serial No. 149,775.

having appropriate permanent connections with the various coils in toe motor. The other plate is ren'iovable, and carries the switch. Since the motor has the permanent contact plate embodied therein, it is only necessary to screw on the switch plate, having not only the switch but appropriately connected contact pieces for the various other coils, whereupon the motor is ready for use. The desired 5, eed may be secured by merely selecting the removable contact plate or switch :'-;uital: lc for that speed and applying; i to the permanent coinact plate.

Each removable contact or switch plate may be marked to indicate the work that will be performed by the motor when said plate is tastencd thereto. An assortment of these removable plates may be kept in stock. that when a dealer receives an order for a motor tor either alternating or direct current, and for a certain trequency and a certain voltage and speed, he needs only to select. the plate which is marked for such current, trequency, voltage and speed, and secure the same upon the motor, whereupon it is ready for the customers use. Vhere the owner of a motor has occasion to use the same ina different circuit or for ditterent range of speed or itreqnency, etc, he needs only to secure from the dealer an appropriate plate and substitute it for the old plate on the motor, whereupon it ready tor use in the new environi nt. lVhen the user has to employ the motor in a variety of circuits, as in. the case of a portable machine. he nay purchase a motor with a complete set of cont-act plates, so that he can use it under all ordinary conditions. The connections are made automatically, by fastening the appropriate contact plate in POSltl-OH, whereupon the contacts make the necessary connections. An unlimited number of cmnbinations may be up, as explained in said patent.

It will thus be seen that the improved removable plate diselosed herein may be used alone, or may it desired form one of such a set of plates that may be in the possession of the user oi? the alterable motor, or that may be kept in stock by the manufacturer of the motor. tor supplying a variety oit requirements. It wil thus be seen that small expense and by imple and satisfactory means the adaptability and usetulness of the Cal motor may be substantially increased by the use of the interchangeable novel speedregu lating switch plates.

This application is a division of my application, Serial No. 520,488, filed December 7, 1921, (now Patent No. 1,608,613, dated November 30, 1926).

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is a section taken horizontally an d longitudinally through the contact plate.

Figure 2 is a vertical section of the con tact plate.

Figure 3 is a side elevation of the contact plate.

Figure 4 is a diagram of the motor showing the positions of the several coils for which the contact plate affords the required connections.

Figures 5 to 8 are diagrammatic views to show how the circuits are built up. Figure 5 shows in full lines the connections within the motor. Figure 6 is an inverted view of a detachable contact plate which co-operates with the terminals seen at Figure 5, to build up circuits as indicated in dotted lines in Figure 5, and in full lines in Figure 6. Figure 7 is a view of the other side of the plate seen at Figure 6, indicating diagrammaticah ly the same circuit leads and also showing the leads which extend from some of the terminals to a set of switch terminals, the latter shown in section. Figure 8 shows the complete circuit built up by the parts showi'i in Figures 5 to 7.

Figures 9 to 12 show diagrams similar to Figures 5 to 8, but with the field coils arranged all in parallel, and with one set of auxiliary coils arranged in parallel with the other set.

One form of motor with which the present invention may be used is fully described in my aforesaid patents. Briefly described, the motor shaft is seen at 10, carrying an armature 41. Said shaft is journaled in bearings carried by partly shown heads of the framework. The armature is provided with a commutator 4:7 to co-operate with brushes 48.

The main field coils are marked L9, 50, 51,

I 52, preferably two at each pole of the magnet, and capable of being connected in either series or parallel at each pole. The opposite poles are marked 53, 5a, and these project inwardly from a magnet core which is designated generally as and which is roughly 0t annular or endless form.

The auxiliary coils 66 to 73 are equally distributed. on opposite sides of the ring, as shown in Figure 4.

Nhen the motor is used for alternating current, tie auxiliary coils 66 73 taken together form in effect the middle or neutral portion of the annulus into two separate magnets, which work against the tour magnets tormed by the field coils 49-52.

At Figure 1 is shown a section or a terminal plate 83 of insulating material secured upon the inner side of the partly-shown motor-head 45 by means of screws 8%; the terminal plate 83 being well within the head so as to accommodate the corresponding contact plate or block which is removable. Lhe permanent or fixed terminals are in the form of heads 87 formed on posts 88 which are connected to the ends 89 of the various circuits. The arrangement of the terminals seen at Figure 5, which also shows a diagram of the coils, etc, the commutator terminals being indicated at 90. Appropriate contacts 91 (Figures 1 and 3) depend from the contact plate, which includes an insulating block 92 to which they are secured by brass rivets 93, the ends 94 of which may be electrically connected by wires 95 in various wa to meet. various requirements. The block 92 may be secured to the bottom oi a plate 96, Figure 1, which, together with the cover plate 86, may form a box having sides 9? and ends 98 to contain the wires 95 and heads 94.. Screws 99 may pass back through holes 100 in the cover plate 86 and the bottom plate 96 and thread into holes 101, Figure 1, in the head 45 ot the motor casing tor detachably securing the contact plate in position with the contacts engaging the appropriate terminals 87.

As one example of the various internal connections that may be made in the motor, there is shown at Figures 5 to 8 tie manner of connecting for alternating current volts, 30 cycles. It will be seen that, in this instance, the field coils are divided into two sets of two coils each, the coils in each set being in series while the sets themselves are in parallel.

A diagram of the connections so described. is seen at Figure 5, and Figure (which shows the plate 92 inverted) gives the arrangement of contacts 91 therefor. it will be understood that this is only one of many arrangements of contacts that may be made up in adapting the motor for dil terent conditions, as set forth in my aforementioned Patent, No. 1,5543%, and Figure 3 (which is not inverted) gives in dotted lines the locations for all such contacts. Each of them may have a nib 102, and these nibs may fit into longitudinal scores or grooves 10?) and transverse grooves 10% :tormed in plate 92, to hold the contacts against rotative or other displacement.

Upon the outer face oi: plate 86 may be mounted a speed-controlling switch lever 105, pivoted between its ends at 106. and servin enable the user to determine how many or U) the auxiliary coils (which are arranged in sets. the coils of each being in series as at Figure 5) shall be effective. At Figure 8 auxiliary coils 69 and 70 are cut out ofthe circuit by the adjustment of said lever 105, so that, owing to the reduced opposition offered by auxiliary coils to field coils, the motor does not run at its lowest speed. It will c understoml that one auxiliary coil is cut out at each side of the motor as seen at Figure as it desired that the two sides should balance. Terminals 87 and 93 indicated as 107, 108, 109 and 110 for the auxiliary coils {it--09 may be arranged oppositely from terminals 87 and 93 indicated as 111, 112, 113 and 114 for the auxiliary coils 7073. It will also be seen that lever-contacts 115, 110, 117 and 118' (connected by leads 123 to terminals 111114) are opposed respectively to lever-contacts 1.19, 120, 121 and 122 (connected in inverse order by leads 124to terminals 107 -110) and that, in shifting about its pivot, each step of the switch-lever cuts in or out a pair of coils; these positions of the lever being shown at Figure 7. These eight switch terminals are seen at Figures 7 and 8 connected by these short leads 123 and 124 to the corresponding auxiliary-coil contactpins 93 in plate 92.-

Figures 5 to 8 are diagrams of the terminal system. Figure 5 represents in full lines the terminals on plate 83, which are pcrn'ianently connected to the various coils in the motor and armature. The remaining Figures 6 to 8 are diagrammatic views of the attachable contact plate. Figure 6 shows the plate 92 in detached, inverted position, to disclose the contacts 91, which engage the terminals 87 and e lifect the connections which are indicated by dotted lines in Figure 5. It will be seen at Figure 6 that certain of the con-- tacts 91 or terminals 93 areconnected by wires 95, corresponding to the wires seen in dotted lines in Figure 5.

It rill be seen by comparing Figures 5 and 6 that the wiring is complete, except that connections are lacking-from one series of auxilia y coils across to theother series. This crt connection is efl'ected only'by'lever 105, and Figure 7 shows diagrammatically the plan of plate 92; that is, Figure 7 gives a view of one side of the plate and Figure 6 of the other side; the wiring being also indicated diagrammatically at Figure 7.

At Figure 7 are also shown in section the switch-terminals 115 to 122 with whichthe ends of the lever may contact, thus eli ecting a variety of connections from the auxiliary coils in one series to those in the other series, thereby cutting in and out different numbers of coils.

lVhen the lever 105 is in the position marked A, at Figures 7 and 8, the two auxiliary coils 7 0 and 69 are cut out, so that the motor runs somewhat above its lowest speed, inasmuch as the tendency of auxiliary coils to oppose the field coils is now reduced. It will be understood that, when said lever is at the extreme left-hand position, connecting terminals 118 and 122, all of the auxiliary coils are cut in, and hence the motor runs at its lowest speed.

\Vhen said lever is in a vertical position (indicated at Figure 3) it connects terminals 11.6 and 120, whereby auxiliary coils 70, 73, 09'and 66 are cut out. With so many coils cut out, the opposition to the field coils is so greatly reduced that the motor runs nearly at its highest speed. WVhen the lever is swung to the extreme right-hand position, Figure 8, and connects terminals and 119, all of the auxiliary coils are cut out except 71 and 68, so that the motor runs at its highest speed. There need be no provision for cutting out coils 71 and 68, as it is always desirable to keep at least these two coils cut in, thereby maintaining uniformity of speed and gaining theother advantages pertinent to auxiliary coils.

hen one end of the lever 105 is swung trom one terminal to the next, thereby cutting out a coil in one series,'its other end has a corresponding swing, thereby cutting out a coil. in the other ser so that two coils are cut out or cut in at each such shift of the lever. It is also desirable for the operating coils in each series to balance those in the other series; oppositely-arranged coils 71 and 68 being always in, 72 being cut out or in at the same time with G7, 73 with 60, and 70 with 69. This gives the desired balance or effect in con nection with the operation of the motor. In order to secure this result, notwithstanding the shifting of the ends of the lever in opposite directions, there is provided an inversion of the order of the connections 124 between the terminals 107-110 on plate 92 and the switch terminals 119122 on plate 86, as indicated at Figure 7.

At Figure 8 is indicated the course of a currentwhen the complete connection and controlling device is attached to the motor and the lever 105 is swung to the A position. The current may be regarded as entering at 125 and dividing at terminal 126. Part of the divided current passes through the lield coils 50, 19 and the other part of the divided current passes through 51 and Both. parts t-hen pass to terminal 127 and thence to the main. From 126 the remainder of tlie divided current passes through auxiliary coils 71, 72 and 73 to terminal 117 and thence through lever 105 in position A to terminal 121, thence through auxiliary coils ($6, 07, (38 to the armature 41 and to teri'uinal 127 and thence to the main.

A housing for the switch 105 may be provided by a plate 128, which may serve as a cap plate for the contact plate, and may carry a name plate 129 to designate the cycles, voltage and other data relative to the motor; this plate 129 being secured by rivets 130, which hold together all the plates in the detachable device, namely, 92, 96, 86, 128 and 129. These rivets are preferably headed at their outer ends and clinched over at their inner ends, as at 131. The plate 128 has an undercut portion 132 to form a clearance or housing 133 for the lever 105- The lever may have a linger-piece 134 to project up above the top of the COlllJtlCb plate, Figure 2, the plate 128 being cut away at 135 to accommodate the movement of said fingerpiece. The screws 99 pass through plate 128 andhold the entire device detachably upon the motor. Upon rei'noving these screws 99, the contact plate may be removed, and another one substituted, to adapt the motor for different current, or work or speed; and the substituted device may or may not have a switch 105, etc, or other m ans for changing speed at will. The switch, lever or speedchanger 105 may be used in connection with other combinations of field coils, etc.

It will. be understood, as set forth in my aforesaid Patent No. 1,554,647, that the field coils can be connected across the mains in either series or parallel relation, and that the connection or" the auxiliary coils can be changed to correspond with any such relation 01" the field coils, so that they co-operate with the field coils and the armature to regulate the speed of the motor, and that the lever 105 may still be employed for cutting out one or more auxiliary coils from each series, for increasing the speed of the motor to the extent desired. Such reconnection of the coils may be effected by the use of appropriate contacts and wirings, which may be made upon a substitute plate such as 92, 96, and such substitute plate may also carry a plate 86 and lever 105, thus forming a contact plate which may be substituted bodily for he one illustrated; and the user of the motor provide himself with a large number of other contact plates, several of which may have speed-changing levers 105, and any contact-plate, whether with or without a speedchanging lever, may be readily substituted in the motor.

Figures 9 to 12 correspond with Figures 5 to 8, but show another contact plate having suitable contacts and wiring for alternating current, 60 cycles, 130 volts, or 120 cycles, 260 volts, or 30 cycles, volts. In Figures 9 to 12, the field coils are connected separately across the line or in parallel, to make it suitable for 130 volts. 60 cycles. To trace the connection of the field coils, at Figure '2, it will be seen that the current coming in from main 125 passes through coil 50 and returns through diagonal wire 127 to the other main V 128. Again, the current flows "from main 125 through diagonal wires 129, 130, to coil 49,

I and returns through diagonals 131, 182 and rent also flows through 125 and through diagonals 129, 130 and 133 to coil 51 and then through diagonals 132 and 127 to the main 128. The set of auxiliary coils 70, 71, 72, 73 has a series arrangement, and the same is true of the auxiliary coils 66, 67, 68 and 69. One series is therefore in parallel with the other series of auxiliary coils; and, by means of lever 105, an auxiliary coil may be cut out of each set simultaneously, or two coils may be cut out, or three, from each set; one coil always remaining connected in each set, as in the arrangement at Figures 5 to 8.

Referring to Figure 12, it will be seen that the current flowing in from the main 125 divides at the terminal 126, part flowing through the parallel field coils, and the remainder flowing through a wire 134 to a terminal 135, where it subdivides, one portion of the subdivided current flowing through the coils 71, 72, 73 and lead 123 to switchterminal 117, thence through the lever 105, wire 136, armature 41, and thence out through the main 128. The other part of the current subdivided at 135 flows through a wire 137 and auxiliary coils 69, 66 and 67 to switchterminal 121, and thence through lever 105 and wire 136 to the armature and out to the main 128. The auxiliary coils are connected to oppose the field coils, and their opposition may be reduced without altering the parallel arrangement of the two sets or series of auxiliary coils. It will be noted that the switch leads 138 from the coils 66, 67 68 are not reversed in their order, as is the case with the leads 124 at Figure 8.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim:

1. A removable connection and control block for a motor, including a supporting member, insulated contact-pieces thereon designed for detachable connection to contacts on a motor-terminal member, permanent electrical connections between certain of said contact-pieces, and a switch-device tor selectively effecting different connections of certain of said contact-pieces.

2. A removable connection and control block for a motor, including a supporting,

on a motor-terminal member, a switch-device having a shift-able handle or finger-piece, permanent electrical connections between certain contact-pieces and between certain contact-pieces and said switch-device, and enclosing means forming part of said block and designed to enclose said permanent Connections and all oi? said switch-device except its handle or finger-piece.

4. A removable connection and control. block for a motor, including a supporting member, insulated contact-pieces thereon designed tor detachable connection to contacts on a motor-terminal member, a switch-device having a shiftable handle or finger-piece, permanent electrical connections between certain contact-pieces and between certain contact-pieces and said switch-device, and enclosing means forming part of said block and designed to enclose said permanent connections and all of said switch-device except its handle or finger-piece, said contact-pieces arranged at the inner or motor side of said block and said handle or finger-piece arranged to be accessible from the outside of the motor when said block is attached thereto.

5. A removable connection and control block for a motor, including a supporting member, insulated contact-pieces thereon designed for detachable connection to contacts on a motor-terminal member, a switch-device having a shiftable member and also having contact-points arranged so that at each step of the switch-member a different pair of contact-points is engaged, and permanent electrical connections between certain contactpieces and between certain contact-pieces and said switch-device, said switch-device serving to selectively effect dilierent connections of certain pairs of contact-pieces, thereby to out in or out certain pairs of motor-elements.

6. A removable connection and control block for a motor, including a supporting member, insulated contact-pieces thereon designed for detachable connection to contacts on a motor-terminal member, a switch-device, and permanent electrical connections between certain of said contact-pieces and between certain contact-pieces and said switch-device, said switch-device serving to selectively efi'ect different connections of the contact-pieces connected therewith, said switch-device in cluding a supporting plate or member formin g part of said. block and designed to overlie and thereby enclose said permanent electrical connections.

ALFRED E. OSXVALD, 

